IHI VF Turbos Info

[Black Night]

is there a reason that the VF-23 is called the secret weapon?

[suddenthomas]

Originally Posted by dumdum

Only the VF36,VF37,VF38 and VF42 are twin scrolls.The VF23 is not,but it is a roller bearing turbo. The VF23 uses the same P20 turbine housing that the VF22 uses,which is not a twin scroll design.

So really they are just a newer version of the vf22?

[dumdum]

The fact that they are a roller bearing design with a compressor bigger than the VF30/VF34 and spool up faster than a VF22 and probably a VF30 makes it a pretty potent turbo.I like the VF24 as well.

[suddenthomas]

Which turbo are you running DUMDUM?

[dumdum]

Ported and polished stocker right now.Needed to make some dough so the bigger turbo had to go!

[dumdum]

Also three more VF series turbos not one the original list:

IHI VF43
(250-325whp, Bolt-On)
This is the standard equipment turbocharger used on the MY07 USDM Subaru Impreza WRX STI. It can be found on both base STI's and STI Limited's. The VF43 utilizes a thrust bearing design and the P15 exhaust housing. The difference between the VF43 and the VF39 used previously on STI's is the size of the wastegate. The VF43 has a larger wastegate designed to reduce boost creep issues.
Expect to achieve full boost with the proper mods and a quality tune between 3000-3500rpms

IHI VF40
This is the standard equipment turbocharger used on the USDM Subaru Legacy GT. It can be found on all the current model years from 2005-2007.


IHI VF41
This is the standard equipment turbocharger used on the JDM Subaru Forester STI. It utilizes a P18 exhaust housing.

[WReXd]

This guy's apparently selling a vf48...??? http://www.thepartstrader.com/forum/...24510#msg24510

[dumdum]

Apparently its an old turbo that used to come on some of the 1.8L turbocharged Subaru's (GL10).Its also known as a VJ11.Very tiny!I actually have one in my garage that i was porting!

[VD5505]

I just put a VF22 on my 03 and i love it, it does take a little longer to spool up but its worth it in the long run i think. great info on the turbos by the way!!!!

[dumdum]

Originally Posted by WReXd

This guy's apparently selling a vf48...??? http://www.thepartstrader.com/forum/...24510#msg24510

Now there is a "new" VF48.Comes on the 2008 STi's.Basicly the same thing as a VF43 but uses a new 5 arc compressor design.

[tom_noland]

Does anyone know what size injectors to use with a TD05H-Big 16G Turbocharger? What about fuel pump size too?

[wrxman420]

I would say get some 650cc injectors. Also a warlbo 255lph fuel pump will work. Has anyone over here ever heard of the IHI VF48 turbo. I have been reading over on nasioc and it comes on the 08 STi's. It has comparable numbers to an 18G.

[tom_noland]

thanks man

Another question. Would a big 16g run well with a TMIC? Not the stocker, but an aftermarket bigger TMIC.

[tom_noland]

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[Black05WRX]

Oh ya, your still able to cool the air charge...